What's new:
- Python SDK with pip install omnimesh (PyO3 bindings)
- Cross-process TCP communication (lightweight + production modes)
- Graceful shutdown, health checks, condvar-based efficient polling
- ROS 2 bridge (geometry_msgs/Twist, diagnostics, vision_msgs)
- UDP gossip multi-packet fragmentation fix
- 138 Rust tests + 21 Python tests passing
- Professional documentation for both Rust and Python